AUDIO AND VISUAL SYSTEM(except 8 Speakers), Diagnostic DTC:B1579

DTC Code DTC Name
B1579 Voice Recognition Microphone Disconnected

DESCRIPTION

The radio receiver assembly and roof console box assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.

This DTC is stored when a microphone connection detection signal line is disconnected.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1579 Voice Recognition Microphone Disconnected Microphone signal is lost

  • Roof console box assembly

  • Telephone microphone assembly

  • Radio receiver assembly

  • Harness or connector

WIRING DIAGRAM

A0004S6E28
*a Roof Console Box Assembly (Telephone Microphone Assembly)
*b Radio Receiver Assembly

PROCEDURE


  1. INSPECT RADIO RECEIVER ASSEMBLY


    1. A00040OC01
      *a

      Component with harness connected

      (Radio Receiver Assembly)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H97-48 (MIN-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))


    1. Disconnect the H97 radio receiver assembly connector.

    2. Disconnect the T11 roof console box assembly (telephone microphone assembly) connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H97-49 (SNS2) - T11-1 (SNS2) Always Below 1 Ω
      H97-48 (MIN-) - T11-2 (MCO-) Always Below 1 Ω
      H97-49 (SNS2) or T11-1 (SNS2) - Body ground Always 10 kΩ or higher
      H97-48 (MIN-) or T11-2 (MCO-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)


    1. Remove the roof console box assembly (telephone microphone assembly).

      Click here

    2. A00074HC73
      *a

      Component without harness connected

      (Roof Console Box Assembly (Telephone Microphone Assembly))

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (SNS2) - 2 (MCO-) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    NG

  4. REPLACE TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly with a new or known good one.

      Click here

    2. Clear the DTCs.

      Click here

    3. Recheck for DTCs and check that no DTCs are output.

      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

    REPLACE ROOF CONSOLE BOX ASSEMBLY Click here